- Registered owner
- Hathor Aviation LLC
- Location
- Johnstown, CO
- Owner type
- LLC
- Serial number
- 17264401
- Year built
- 1974
- Type
- Fixed wing single engine
- Engine
- 4 cycle
- Airworthiness
- Standard, normal, utility
- Airworthiness date
- November 22, 1974
- Certificate issued
- November 23, 2021
- Expires
- November 30, 2028
- Mode S code
- AD6623
From the FAA registry file of October 24, 2026. The registry lists only the engine series, so ADs for every Lycoming 0-320 model are included below.
On this page
Airworthiness directives that may apply · 78
Matched by this aircraft’s airframe and engine models. Each AD’s applicability may narrow it by serial number, part number or equipment.
| 1964 | 1 |
|---|---|
| 1966 | 1 |
| 1967 | 1 |
| 1968 | 2 |
| 1969 | 3 |
| 1971 | 2 |
| 1973 | 2 |
| 1974 | 3 |
| 1976 | 2 |
| 1977 | 4 |
| 1978 | 2 |
| 1979 | 3 |
| 1980 | 3 |
| 1981 | 3 |
| 1982 | 2 |
| 1983 | 2 |
| 1987 | 1 |
| 1988 | 2 |
| 1989 | 1 |
| 1990 | 1 |
| 1991 | 2 |
| 1992 | 1 |
| 1993 | 1 |
| 1996 | 4 |
| 1997 | 2 |
| 1998 | 5 |
| 2000 | 3 |
| 2002 | 1 |
| 2004 | 1 |
| 2005 | 1 |
| 2006 | 3 |
| 2007 | 1 |
| 2008 | 2 |
| 2009 | 1 |
| 2010 | 2 |
| 2011 | 2 |
| 2012 | 1 |
| 2017 | 1 |
| 2022 | 2 |
| 2023 | 1 |
| 2024 | 2 |
| 2026 | 1 |
See all 84 ADs
Information bulletins that may apply · 19
Advisory, not mandatory.
See all 29 bulletins
NTSB investigations
No NTSB investigations matched to N9621VMatched by N-number and event date, checked against the reported serial number, make and model. Investigations from before this aircraft carried the mark are under Earlier aircraft. Investigations on Cessna 172M aircraft
FAA incident reports
No FAA accident or incident reports matched to N9621VMatched by N-number and event date, checked against the reported make and model. Reports from before this aircraft carried the mark are under Earlier aircraft. Reports on Cessna 172M aircraft
Service difficulty reports · 6
Matched to this aircraft by N-number and event date, checked against the reported serial number, make and model.
SDR 05308Seal · leakingDURING 100 HOUR INSPECTION, FOUND ENGINE VACUUM PUMP DRIVE LEAKING OIL AND CONTAMINATING VACUUM PUMP. REMOVED VACUUM PUMP AND ENGINE VACUUM PUMP ADAPTOR DRIVE ASSEMBLY. FOUND SEAL P/N STD-1774 NOT FULLY INSTALLED IN DRIVE ASSY. REPLACED SEAL AND VACUUM PUMP, SDR 20000413SH054Cylinder · damagedPILOT REPORTED ROUGH RUNNING ENGINE AND LOW RPM. MAINTENANCE FOUND NR 4 CYLINDER HAD EXHAUST VALVE STUCK OPEN, NR 4 CYLINDER PUSH ROD AND HOUSING WERE BENT WITH NO OIL LEAKAGE. THE PISTON WAS NOT DAMAGED AND NO METAL FOUND IN THE ENGINE OIL FILTER. (X)SDR 98ZZZX3560Cylinder · mismanufacturedENGINE L-34695-27A O/H BY TEXTRON LYC 11-8-97. INSTALLED 2-20-98. FOLLOWING TEST FLIGHT AND BREAK-IN, ACFT RELEASED FOR FLIGHT TRAINING. AT ENG SMOH 16.8 HRS ON TAKEOFF, A LOSS OF RPM AND DEGRADED CLIMB PERFORMANCE REQUIRED IMMEDIATE RETURN. SUBMITTER STATSDR 98ZZZX3559Cylinder · mismanufacturedENGINE L-34695-27A O/H BY TEXTRON LYC 11-8-97. INSTALLED 2-20-98. FOLLOWING TEST FLIGHT AND BREAK-IN, ACFT RELEASED FOR FLIGHT TRAINING. AT ENG SMOH 16.8 HRS ON TAKEOFF, A LOSS OF RPM AND DEGRADED CLIMB PERFORMANCE REQUIRED IMMEDIATE RETURN. SUBMITTER STASDR 98ZZZX3558Cylinder · mismanufacturedENGINE L-34695-27A O/H BY TEXTRON LYC 11-8-97. INSTALLED 2-20-98. FOLLOWING TEST FLIGHT AND BREAK-IN, ACFT RELEASED FOR FLIGHT TRAINING. AT ENG SMOH 16.8 HRS ON TAKEOFF, A LOSS OF RPM AND DEGRADED CLIMB PERFORMANCE REQUIRED IMMEDIATE RETURN. SUBMITTER STASDR 98ZZZX3561Cylinder · mismanufacturedENGINE L-34695-27A O/H BY TEXTRON LYC 11-8-97. INSTALLED 2-20-98. FOLLOWING TEST FLIGHT AND BREAK-IN, ACFT RELEASED FOR FLIGHT TRAINING. AT ENG SMOH 16.8 HRS ON TAKEOFF, A LOSS OF RPM AND DEGRADED CLIMB PERFORMANCE REQUIRED IMMEDIATE RETURN. SUBMITTER STAT
STCs that may be installed · 595
Approved for this aircraft’s airframe or engine model. The registry doesn’t record which STCs an aircraft has; its records do.
Airframe · Cessna 172M
STC SA01233SEFabrication and installation of Alaskan Bushwheel LLC tail wheel and fork assemblySTC SA00709CHInstallation of replacement wing root vent described by Dwg Nos. 8-30-96-1& 8-30-96-2, no rev, both dtd 8/30/96, or later FAA app rev.STC SA02571SEInstallation of Garmin G500/G600 TXi Integrated Avionics System (Primary Flight Display, Multi-Function Display, and Engine Indicating System Display).